Commit message: Fixed bug #72479 - same as #72434
CVE: CVE-2016-6295
CWE: CWE-416
Vulnerability description: ext/snmp/snmp.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly have unspecified other impact via crafted serialized data, a related issue to CVE-2016-5773.

Project: php-src
File: snmp.c

PHP_MINIT_FUNCTION(snmp)
{
	netsnmp_log_handler *logh;
	zend_class_entry ce, cex;

	le_snmp_session = zend_register_list_destructors_ex(php_snmp_session_destructor, NULL, PHP_SNMP_SESSION_RES_NAME, module_number);

	init_snmp("snmpapp");

#ifdef NETSNMP_DS_LIB_DONT_PERSIST_STATE
	/* Prevent update of the snmpapp.conf file */
	netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DONT_PERSIST_STATE, 1);
#endif

	/* Disable logging, use exit status'es and related variabled to detect errors */
	shutdown_snmp_logging();
	logh = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_NONE, LOG_ERR);
	if (logh) {
		logh->pri_max = LOG_ERR;
	}

	memcpy(&php_snmp_object_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
	php_snmp_object_handlers.read_property = php_snmp_read_property;
	php_snmp_object_handlers.write_property = php_snmp_write_property;
	php_snmp_object_handlers.has_property = php_snmp_has_property;
	php_snmp_object_handlers.get_properties = php_snmp_get_properties;

	/* Register SNMP Class */
	INIT_CLASS_ENTRY(ce, "SNMP", php_snmp_class_methods);
	ce.create_object = php_snmp_object_new;
	php_snmp_object_handlers.clone_obj = NULL;
	php_snmp_ce = zend_register_internal_class(&ce TSRMLS_CC);

	/* Register SNMP Class properties */
	zend_hash_init(&php_snmp_properties, 0, NULL, NULL, 1);
	PHP_SNMP_ADD_PROPERTIES(&php_snmp_properties, php_snmp_property_entries);

	REGISTER_LONG_CONSTANT("SNMP_OID_OUTPUT_SUFFIX",	NETSNMP_OID_OUTPUT_SUFFIX,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OID_OUTPUT_MODULE",	NETSNMP_OID_OUTPUT_MODULE,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OID_OUTPUT_FULL",		NETSNMP_OID_OUTPUT_FULL,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OID_OUTPUT_NUMERIC",	NETSNMP_OID_OUTPUT_NUMERIC,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OID_OUTPUT_UCD",		NETSNMP_OID_OUTPUT_UCD,		CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OID_OUTPUT_NONE",		NETSNMP_OID_OUTPUT_NONE,	CONST_CS | CONST_PERSISTENT);

	REGISTER_LONG_CONSTANT("SNMP_VALUE_LIBRARY",	SNMP_VALUE_LIBRARY,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_VALUE_PLAIN",	SNMP_VALUE_PLAIN,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_VALUE_OBJECT",	SNMP_VALUE_OBJECT,	CONST_CS | CONST_PERSISTENT);

	REGISTER_LONG_CONSTANT("SNMP_BIT_STR",		ASN_BIT_STR,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OCTET_STR",	ASN_OCTET_STR,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OPAQUE",		ASN_OPAQUE,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_NULL",		ASN_NULL,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_OBJECT_ID",	ASN_OBJECT_ID,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_IPADDRESS",	ASN_IPADDRESS,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_COUNTER",		ASN_GAUGE,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_UNSIGNED",		ASN_UNSIGNED,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_TIMETICKS",	ASN_TIMETICKS,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_UINTEGER",		ASN_UINTEGER,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_INTEGER",		ASN_INTEGER,	CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SNMP_COUNTER64",	ASN_COUNTER64,	CONST_CS | CONST_PERSISTENT);

	REGISTER_SNMP_CLASS_CONST_LONG("VERSION_1",			SNMP_VERSION_1);
	REGISTER_SNMP_CLASS_CONST_LONG("VERSION_2c",			SNMP_VERSION_2c);
	REGISTER_SNMP_CLASS_CONST_LONG("VERSION_2C",			SNMP_VERSION_2c);
	REGISTER_SNMP_CLASS_CONST_LONG("VERSION_3",			SNMP_VERSION_3);

	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_NOERROR",			PHP_SNMP_ERRNO_NOERROR);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_ANY",			PHP_SNMP_ERRNO_ANY);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_GENERIC",			PHP_SNMP_ERRNO_GENERIC);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_TIMEOUT",			PHP_SNMP_ERRNO_TIMEOUT);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_ERROR_IN_REPLY",		PHP_SNMP_ERRNO_ERROR_IN_REPLY);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_OID_NOT_INCREASING",	PHP_SNMP_ERRNO_OID_NOT_INCREASING);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_OID_PARSING_ERROR",	PHP_SNMP_ERRNO_OID_PARSING_ERROR);
	REGISTER_SNMP_CLASS_CONST_LONG("ERRNO_MULTIPLE_SET_QUERIES",	PHP_SNMP_ERRNO_MULTIPLE_SET_QUERIES);

	/* Register SNMPException class */
	INIT_CLASS_ENTRY(cex, "SNMPException", NULL);
#ifdef HAVE_SPL
	php_snmp_exception_ce = zend_register_internal_class_ex(&cex, spl_ce_RuntimeException, NULL TSRMLS_CC);
#else
	php_snmp_exception_ce = zend_register_internal_class_ex(&cex, zend_exception_get_default(TSRMLS_C), NULL TSRMLS_CC);
#endif

	return SUCCESS;
}